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Suppose we are studying the failure time (at high stress) of a certain engine part. The failure times have a mean of 1.4 hours

Suppose we are studying the failure time (at high stress) of a certain engine part. The failure times have a mean of 1.4 hours and a standard deviation of 0.9 hours. If our sample size is 40 engine parts, then what is the sampling distribution of the sample mean? What is the probability that the sample mean will be greater than 1.5?

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